Deck 14: Float Switches and Liquid Level Sensors

Question 1

In a mercury bulb switch, when the liquid level is below the position of the bulb, it is suspended in a horizontal position.

Answer 1

False

Question 2

What controls the operation of a float switch?

Answer 2

The operation of a float switch is controlled by the upward or downward movement of a float in a tank of liquid.

Question 3

Float switches can be used to pump water from a tank or sump.

Answer 3

True

Question 4

The bubbler system employs the use of float switches.

Question 5

What is a big advantage of the microwave level gauge?

Question 6

In the mercury bulb switch, how is the differential level of the liquid determined?

Question 7

What is a big advantage of the bubbler system?

Question 8

What is the principle on which the bubbler system operates?

Question 9

The ____________________ gauge is ideal for measuring the level of turbulent, aerated, solids-laden, viscous, corrosive fluids.

Question 10

In the bubbler system, the pressure required to bubble air through the pipe is directly proportional to the ____________________ of the liquid.

Question 11

In the bubbler system, a(n) ____________________ is used to adjust the maximum air flow.

Question 12

Figure 14-1


The accompanying figure shows a(n) ____________________ operated float switch.

Question 13

Float switches are used to control the action of a(n) ____________________ in accordance with the level of a liquid in a tank or sump.

Question 14

The microwave level gauge operates by emitting a high frequency signal of approximately 24 GHz. into a tank and then measuring the frequency difference of the return signal that bounces off the product.

Question 15

Figure 14-2


The accompanying figure shows a rod operated float switch.